Release of Dioxins from Solid Waste Burning and its Impacts on Urban Human Population- A Review
Received Date: Oct 12, 2017 / Accepted Date: Feb 15, 2018 / Published Date: Feb 21, 2018
Dioxins are highly persistent toxic compounds that stay in the food chain and environment for long time. In light of many recent and past studies, it is estimated that apart from various sources of dioxins release, one of the most prominent is the burning of solid waste whether open or through incineration. Dioxins are known for their reproductive and endocrinal disruption properties as well as causative agent for skin problems such as chloracne irrespective of the age and sex. Various case studies at large levels like as of Agent Orange and at individual levels support the toxic behavior of dioxins. Release of dioxins from solid waste burning can be controlled by considering some preventive protocols and following them seriously at the burning or incineration site.
Keywords: Dioxins; Solid waste; Urban; Emissions; Chloracne; Teratogenic; Mutagenic; Carcinogenic
According to the organization world meters, current population of Earth in 2017 has reached 7.4 billion and is constantly progressing towards the mark of 7.5 billion. Greater the population, greater the exposure of pollutants. Globally, more people reside in urban areas than in rural areas, with 54% of the world’s population residing in urban areas in 2014. In 1950, approximately 30% of the world’s population was metropolitan and by 2050, 66% of the world’s population is expected to migrate towards cities for better facilities and exposure .
Dioxins are among the most harmful and hazardous chemical known to mankind with chemical structure indicated in Figure 1. A report issued by USEPA stated that dioxins pose a serious threat to life. Dioxins are chemicals that persist in the environment for a long time . They belong to the ‘Dirty Dozen’ mainly known as Persistent Organic Pollutants (POPs). The expression “dioxins” is regularly utilized for the group of basically and artificially related polychlorinated dibenzo para dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). An aggregate of about 419 types of dioxin-related compounds have been recognized but merely 30 of these are known to have noteworthy toxicity, TCDD tops the list in toxicity .
Dioxins are shaped principally as byproducts of incomplete burning and different chemical processes. A correlation of four different profiles demonstrated that the development of polychlorinated dibenzo-pdioxins (PCDD) and dibenzofurans (PCDF) was fast and essentially happened in the 640-400°C temperature region .
According to different reports and incidents, dioxins have been used in many incidents intentionally or exposed via accidental releases. One is the case study of agent also known as Herbicide Orange was one of a class of color-coded herbicides. It was called Agent orange as the herbicide was brought in black drums with orange stripes on it .
US forces used dioxins over the rural landscape in Vietnam to kill shrubs, food crops and trees over large areas to expose the militant groups hiding in the floral canopies. Agent Orange was a 50-50 mixture of two individual herbicides 2,4-D and 2,4,5-T. When degraded it formed dioxin’s most toxic form that was 2,3,7,8-Tetrachlorodibenzodioxin . As indicated by a review by a Vietnamese researcher, Dr Nguyen Viet Nhan, in the zones where Agent Orange was kids and grown-ups are experiencing different wellbeing issue, including cleft palate, mental handicaps, hernias, and additional fingers and toes . Later in 1960s abnormal amounts of dioxin were found in the breast milk of South Vietnamese ladies, and in the blood of U.S. military staff who had served in Vietnam .
Another case is of Love canal, New York. As per a few reports Municipal waste and additionally some fly ash were deposited in the channel. Research center investigations of soil and sediments from the Love Canal show the presence of more than 200 (confirmed) organic compounds. Dioxins (2,3,7,8-tetrachlorodibenzoparadioxin) was one of the chemicals found in the landfill. Since dioxin (TCDD) is a contaminant released as byproduct in the production of trichlorophenols (TCPs). The most abnormal amount of dioxin measured to date at the Love Canal is roughly 300 parts for every billion (ppb) in a storm sewer connecting the canal .
Dioxin Scenario around the World
For many reasons dioxins are considered to be dangerous and are posing a serious threat to human race. Mainly because they are highly persistent and resist physical, chemical and biological degradation for years . As a result, they continue to accumulate over time, reaching mostly up to high levels in aquatic sediments and in the atmosphere . Natives of Arctic Canada for example, have some of the highest body burdens of PCBs (poly chlorinated biphenyls) dioxins and furans, due to diet reliant on fish and marine mammals from a local food chain polluted by dioxin from remote industrial sources .
Waste production in the urban World
As the world is moving towards its urban future, the measure of metropolitan solid waste (MSW), a huge negative contribution by urban way of life is becoming significantly speedier than the rate of urbanization. Ten years prior there were 2.9 billion urban occupants who produced around 0.64 kg of MSW per individual every day (0.68 billion tons for each year). This report evaluates that today these sums have expanded to around 3 billion occupants producing 1.2 kg for each individual every day (1.3 billion tons for each year). By 2025 this will probably increment to 4.3 billion urban inhabitants creating around 1.42 kg/capita/day of metropolitan waste (2.2 billion tons for each year) .
Waste accumulation rates in relation to Income
Normal waste accumulation rates are specifically identified with salary levels. Low-wage nations have waste collection rates, around 41%, while high-salary nations have higher waste collection rates averaging about 98%  as indicated in Table 1 and Figure 2.
|MSW Disposal Techniques in Lower Middle Income Countries||(Million Tonnes)|
Table 1: MSW disposal techniques in lower middle income countries .
Waste burning throughout the world
To deduce outflows from junk fires, specialists, analyzed demographical figures and per capita rubbish generation with official counts of waste disposal for every nation on the planet. They assessed that 1.1 billion tons (1 billion metric tons) or 41 percent of the aggregate waste created worldwide is discarded through unregulated burning each year. The nations that deliver the most aggregate waste as per true and official studies are vigorously populated nations with different levels of modern advancement: China, the United States, India, Japan, Brazil and Germany. In any case, the review presumed that the countries with the greatest emissions from junk blazing are crowded nations: China, India, Brazil, Mexico, Pakistan and Turkey .
Waste burning as source of dioxins
Solid waste is a noteworthy donor towards air contamination if not properly addressed. Strong waste involves different waste classifications including residential, institutional, industrial, commercial, construction, destruction, municipal and agricultural procedures that create an immense chunk of solid waste . Burning the waste (such as refuse, building material scraps, rural waste and so forth) openly is the normal behavior of citizens and waste collectors to reduce its volume by uncontrolled ignition in open yard or in barrels. These conditions result in inadequate burning and discharge destructive air contaminants, for example., fine particulates, PAHs, heavy metals, and dioxins .
Solid waste is generally singed by burning or gasification. Incineration or ignition is a volume reduction technique in which cities solid waste is burnt at high temperatures so as to change over them into small components and vaporous items. The greatest favorable position of this sort of strategy is that it can decrease the volume of solid waste to 20 to 30 percent of the first volume; it decreases the space they take up and lessen the weight on landfills. In any case, alongside Pros, cons are an unquestionable issue. If not taken care of properly, burning may prompt to arrival of lethal toxins .
Source of Dioxin Outflow
As of now, the major ecological source of dioxins is open burning or incineration. In 1987 and 1995, the main wellspring of dioxin outflows to the U.S. environment was municipal waste burning. Dioxins have been found in soil, surface water, residue, plants, and creature tissue in all quarters of the earth . Dioxins are exceedingly persistent in the earth with revealed half-lives in soil and sediments extending from months to years. Since dioxins have low dissolvability in water and low instability most are contained in soil and silt that serve as natural supplies from which dioxins might be discharged over a drawn out stretch of time. Volatilization and molecule re suspension from ecological reservoirs are most likely main contributors towards worldwide distribution .
It’s not what you burn, it’s the way you burn it. Modern processes of performing waste combustion are highly planned and are designed to ensure all-out destruction of waste and minutest creation of air pollutants. Environmental administrative and positive industrial activities have brought about radical decreases in combustor discharges of toxins, for example., dioxins and furans, polycyclic Aromatic hydrocarbons (PAHs), and fine particulate matter in the course of recent decades. As indicated by EPA information, dioxin and furan air discharges from city strong waste incinerators declined 86% in between 1987 and 1995 .
Process of dioxin formation
Dioxin and furan creation is a mind boggling and complex process that includes different solid and gas phase reactions between reagents. A mid thermal waste annihilation, dioxins and furans are known to emerge together with combustion gasses, fly ash debris, and even slag . Specialists have inspected two fundamental speculations with respect to the system of PCDD and PCDF arrangement during burning, to be specific the “De Novo Synthesis” (PCDD/PCDF creation from elemental carbon) and dioxin and furan creation from precursors. These theories are not bogus; in reality, they may happen at the same time amid incineration of the carbonaceous material . Heterogeneous reactions lead to dioxin and furan formation in the post-ignition time period. Mainly and basically there are two procedures: First is; The De Novo Synthesis, in which the carbonaceous network blazes along with its oxidation and chlorination. Low oxygen levels (under 2%) may lessen the rate of PCDD/PCDF generation by means of the de novo synthesis. After this the second procedure is assisted catalytic coupling of the precursors-incomplete organic waste combustion in the incinerators that finishes up into organic fragments that can further serve as precursors of dioxin and furan molecules on the fly ash surface .
Waste likely to produce dioxins
Various studies report the confirmation of dioxin development from the ignition of different waste-samples tests, including various types of paper, different sorts of wood, fallen leaves, food tests, PE (polyethylene), PS (polystyrene), PVC (polyvinyl chloride), polyvinylidene chloride and polyethylene tetraphthalate (PET) and different sorts of plastic items. By and large, Development, Destruction/Demolition and road cleaning wastes are not suited for burning. The synthesis of the different sorts of MSW fluctuates incredibly by atmosphere and occasional varieties and the socio-economy of the waste gathering territory .
Chlorine and dioxins
As chlorine is viewed as essential reactant for the development of dioxin so its amount ought to be considered. In a review it was recommended that cumulative chlorine in Solid Waste (SW) ranges from around one-half to around one percent (mass basis) of the aggregate sum of Municipal Solid Waste (MSW) produced. A representative estimate (however not conclusive) tells of a regular measure of chlorine related to the plastics portion in MSW is that about half of the chlorine present comes from the plastics in the waste dump [22,23].
Just a little contribution of the chloride in waste leads to forming dioxins and furans. Even air from a combustor may contain nearly 20 times more chloride than is necessary to produce typical amounts of dioxins and furans from waste combustors. That is the reason expelling chloride contributed by PVC does not affect dioxin and furan creation when genuine mixed waste is burnt, and this has been shown in various logical studies. Dioxin is shaped by smoldering chlorine-based synthetic chemicals with hydrocarbons. The real culprit of dioxin release in the atmosphere is actually the waste-burning incinerators of different sorts and furthermore the all famous backyard barrels .
Pathways of Dioxin Entrance to Human Bodies
Human beings can be exposed to dioxins via three routes and those are direct ingestion, absorption through dermal contact and breathing. Eating contaminated food in particular animal products is the primary pathway for dioxin exposure. Skin contact or breathing typically represents a minor dioxin exposure pathway. When calculating human exposure, dioxins are measured in daily mass picograms (pg). One pg is a trillionth of 1 gram [10-12,25].
Dioxins and furans created by the open smoldering of rubbish are deposited on plants, which are eaten by living creatures. The dioxins and furans are consumed by these creatures and remain in the evolved way of life until at last they wind up in our meat and dairy items . Truth be told more than 90 percent of administration of dioxins and furans in our bodies is from ingestion .
Fish become hazardously toxic due to airborne dioxin admission into the water and also from polluted soil or industrial waste washed into rivers and lakes leading to high sediment concentrations. Breathing (Inhalation) and water pathways are not viewed as critical wellsprings of introduction of dioxins for earthly creatures. Deposition of airborne dioxins onto plant and soil surfaces and ensuing ingestion of this contaminated vegetation and soil by living creatures is viewed as the essential pathway by which dioxins enter the evolved way of life .
Dioxins mechanism of action after entering the body
Dioxin enters the body principally in the food that we eat. The dioxin enters the circulatory system and gets put away in fat and liver cells. Inside of the cell, dioxin ties to a protein called the aryl hydrocarbon (Ah)-receptor, which then ties to a secondary protein called the Ah-receptor-nuclear translocator (Ah-rnt). Ah-rnt conveys the protein-dioxin complex into the cell nucleus. Within the nucleus core, the protein-dioxin complex ties to strands of DNA, which can make certain genes turn on or off and that can bring about issues. This turning on and off of genes is connected to cancers, conceptive issues and diminished immune system functions. It can likewise bring about endocrine disruption.
Various types of molecules tie to the Ah receptor, yet 2,3,7,8-TCDD ties phenomenally well, as though it were the most ideal key for the Ah-receptor lock. It forms a solid unit with the receptor and this unit is known as the receptor-dioxin complex. Dioxins can’t act without the Ah-receptor as it is the key to dioxin complex lock the majority of the harmful activities. Action of dioxin relies on the arrangement of this complex and because of this requirement; TCDD has no impact on living cells which have no Ah-receptors. 2,3,7,8-TCDD is a flat type of molecule which looks like natural hormones; maybe it mimics the original hormone accomplice of the Ah-receptor .
Toxic Equivalency Factor (TEF) and Tolerable Daily Intake (TDI)
Dioxins are for the most part found in mixtures containing a few sorts of dioxins and dioxin-like aggravates, each having its own particular level of poisonous quality. Subsequently each is ascribed a particular harmful factor called Toxic Equivalency Factor (TEF). The TEF plot indicates unfriendly impacts (e.g. cancer) when it forms key lock combination with cell Ah-receptors in our body cells. Other harmful impacts of dioxins and dioxin-like mixes can’t be measured by this technique. The general toxicity of a dioxin blend is ascertained by multiplying the individual amount and number of specific type of toxicants present by its particular TEF and summing the results acquired to get an aggregate TCDD “Toxic Equivalent” (TEQ) for the mixture .
The Dioxins Law endorses the average Tolerable Daily Intake (TDI) and environmental quality standards as essential guidelines for formation of policies on dioxins. Bearable Tolerable Daily Intake (TDI) is 4 pg-TEQ/kg/day (4 pg for every kg of body weight every day). Ambient air yearly normal ought to be not more than 0.6 pg-TEQ/m3, water yearly normal ought not to be more than 1 pg-TEQ/L and base dregs shouldn’t be more than 150 pg-TEQ/g. While in soil it’s ought not to surpass 1000 pg-TEQ/g .
Effects of Dioxins on Human Health
Short Exposure of people to abnormal amounts of dioxins may bring about skin lesions, for example., chloracne, dark patches on the skin, and altered or reduced liver capacity. Long term exposure of dioxins is connected to weakness of the human defense system - immune system, the central nervous system, the endocrine framework and conceptive capacities. Because of the omnipresence of dioxins, all individuals have a specific level of dioxins in the body prompting to so called ‘Body Burden’. Dioxins are all around as soon as they enter in our body after oral introduction; they quickly get broadly distributed throughout the body tissues, with specific gathering in the liver and fat tissues .
Dioxins are also expected to be well absorbed after being inhaled and dermally absorbed. Dioxins are not quickly eliminated and are extremely persistent, the half-life of TCDD in humans is considered to a long time of approximately 7 to 12 years . The most common adverse health effect observed in humans following acute exposure to dioxins, particularly TCDD, is the development of chloracne. Chloracne is an acne-like condition indicated by follicular hyperkeratosis which may include cysts, lumps and reddish pustules and typically involves the hair follicles on the neck and face . The most sensitive effect seen in toxicity studies in animals was developmental toxicity or its teratogenic effects, the effects seen including induction of abortion, changes in behavioral and cognitive function and adverse effects on the developing male reproductive system .
There are two aspects of the environmental behavior of dioxin like compounds which makes them particularly troublesome. First they are surprisingly persistent, resisting physical, chemical and biological degradation for decades and more . As a result, even dilute discharges collect on the environment over time reaching particularly great levels in marine sediments and in the air; dioxins are now disseminated on a truly worldwide basis . Second, dioxins are highly oil-soluble but insoluble in water that indicates their sort of organic nature. They thus bio-accumulate in fatty tissues and are magnified in concentration as they move up the food chain greater than the levels found in the ambient air, soil, sediments. At the apex of the food chain, the human population is particularly contaminated. A range of dioxinlike compounds has been identified in the fat, blood and mother’s milk of general population .
The developing fetus is most delicate to dioxin exposure. Newborn, with fast developing organ systems, may also be more exposed to certain effects. Some people or groups of people may be exposed to higher intensities of dioxins because of their diet, such as excessive consumption of fish (in many parts of the world) or their work places and occupation such as workers in the pulp and paper industry, in incineration plants and at hazardous waste sites . Dioxins have been shown to be cancer causing in animals and humans. In humans, excess risks were observed for all types of cancers, without any specific cancer predominating. In specific studies, excess risks were observed for reproductive cancers (in breasts of females, endometrium, breasts of males and testis) but, overall the pattern is inconsistent. In animals, endocrine, developmental and reproductive effects are among the most delicate to dioxin exposure .
Generally, our body burden of dioxins increments as we get older. But the time of exposure to TCDD during our lives may likewise influence our body weight of dioxin as we grow up. A recent review (Seveso, Italy) demonstrated that young ladies more youthful than age 10, who were exposed to dioxins, held larger amounts of dioxin later as grown-ups, when contrasted with ladies not exposed until teenage or when grown-up .
The dioxin TCDD or 2,3,7,8-tetrachlorodibenzo-para-dioxin (TCDD) is a known tumor or cancer causing agent and different DLCs are known to bring about abnormal cell growth in research animals in laboratories. Also, dioxin introduction has been connected to various kind of infections, including Type II diabetes, ischemic coronary heart disease and a skin break out in the form of a severe acne burst out called chloracne, a sign of dioxin administration. Since dioxin is not broken by microscopic organisms, it perseveres in the earth for drawn out stretches of time, making it a ‘Persistent Organic Pollutant’ .
A review in Taiwan was led to assess the relationship between exposure to dioxin and Diabetes Mellitus (DM). Members were enlisted from an area where the inhabitants were exposed to dioxin discharged from a manufacturing plant. Members were classified into 3 groups as indicated by the level of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the serum. Of the 2898 members, 425 patients of DM were recognized and positive affiliations were seen amongst dioxin and DM. At the point when members were stratified by sex, the serum dioxin level remained an independent hazard figure for DM in both men and ladies. Thus, Exposure to dioxin is a hazard figure for DM, independent of age and BMI in both men and ladies .
Dioxins exposure can prompt to endometriosis which is a frequent pain causing disorder in which tissue that typically lines within uterus develops outside uterus. Endometriosis most generally includes ovaries, fallopian tubes and tissues lining the pelvis. Infrequently, endometrial tissue may spread past pelvic organs . With endometriosis, displaced endometrial tissue keeps on working about as it ordinarily would-it thickens, separates and seeps with each menstruation cycle. Since this displaced tissue has no genuine way to leave your body, it gets distinctly attached. At the point when endometriosis includes the ovaries, growths called endometriomas may frame, bringing about extreme pain however its remedy is possible .
Different impacts thought to be connected with intense high exposures include disturbance in the sleep cycles, poor concentration, depression or tension, raised serum cholesterol and weight reduction in test animals . There is constrained or suggestive proof that TCDD may expand the danger of (transient) peripheral neuropathy, porphyria cutanea tarda and at high introduction levels, sort II diabetes .
Research has demonstrated that kids introduced to regular environmental toxins like dioxin and polychlorinated biphenyls (PCBs) prenatally and amid earliest stages can endure behavioral, learning and memory issues. A University of Maryland School of Medicine psychiatry teacher recommends that the hidden cause of this behavior might be disturbance in the normal activity of thyroid hormone .
Veterans have since a long time ago complained, that exposure to the dioxins through Agent Orange brought on them a variety of medical issues, however few have been confirmed. In 2008, the common prevalence of significant thyroid disorders in the Veterans was checked. Analysts contrasted the frequency of diagnosis and thyroid’s abnormal growth, nodules, hypothyroidism and Graves’ disease in both exposed and non-exposed masses. A sum of 23,939 vets had been classified as exposed to Agent Orange, while 200,109 were not exposed. The scientists found that the pervasiveness of Graves’ disease in those exposed to Agent Orange was three times to that of the unexposed bunch .
In light of both living animal studies and human reviews, US EPA (2012) reasoned that even low exposure to dioxins may assault the normal functions of immune system. This effect is likely because of the impacts of dioxins on the endocrine framework. Introduction to dioxins amid pregnancy is connected with endocrine-disturbing impacts in male newborn children. Genitalia distances that typically are longer in guys than females were diminished among male infants whose moms had higher exposure to dioxins .
Dioxins are the consequence of different industrial procedures and are viewed as the most lethal anthropogenic agent or toxicant. Studies with dioxins in sexually mature and developed laboratory animals demonstrated severe negative impacts to moderately high dosages. The lab animals showed diminished spermatogenesis, diminished testicular weight, and unusual testicles with decreased fertility .
A study demonstrated strange impacts in animals introduced with dioxins in uterus. This review detailed that sperm counts dropped and mutation in the male conceptive tract expanded since they got exposed to dioxins. TCDD can have an anti-androgenic and anti-estrogenic impact, reducing the testicular responses to LH. The impacts of high introduction to TCDD and “TCDD-like” compounds on vital sites for development and reproduction have been perceived for quite a long time. The reproductive framework has even been viewed as the most sensitive “end point” for dioxins .
A larger number of female child than male children were conceived in some Canadian people group because of the fact that airborne poisons called dioxins can adjust ordinary sex proportions, regardless of the possibility that the source of the contamination is numerous kilometers away, analysts say. Dioxin exposure as indicated in many studies is known to increase malignancy (cancer/tumor) rates and birth of more female babies because of the mutagenic and endocrinal disruption properties of dioxins. Ordinarily, 51 percent of births are males and 49 percent are girls. But, the proportion was switched-with as few as 46 guys conceived for each 54 females-in Canadian urban communities and towns where parents or mothers were exposed to dioxins from sources, for example., oil refineries, paper factories and metal smelters as indicated by the review. Utilizing birth information and an inventory of contamination sources, the review likewise presumed that early introduction to dioxins-even at 25 km far from the source-expanded the danger of cancer in the remaining life or coming years of adulthood of 20,000 individuals overviewed during the decade of 1990s .
Disposal of Dioxins from Body
Dioxin works its way to the highest point of the evolved way of life that means up to highest point in food chain. Men have no approaches to dispose of dioxin instead of giving it a chance to separate as per its synthetic half-lives. Women, then again have two ways, which it can leave their bodies. To be specific: (i) Across the placenta into the developing newborn child, (ii) through breast feeding making breast feeding for non-veggie lover moms quite unsafe .
Prevention of Dioxin Formation during Combustion
According to USEPA, the environmental laws that apply to dioxins and their release in environment globally are Comprehensive Environmental Response, CERCLA (Compensation and Liability Act)/RCRA (Resource Conservation and Recovery Act), Hazardous Air Pollutants for Hazardous Waste Combustors and Clean Air Act, TSCA (Toxic Substances Control Act), EPCRA (Emergency Planning and Community Right-to-Know Act) and SDWA (Safe Drinking Water Act) +2. According to WHO, the levels of dioxins in food (manly seafood) should not exceed 3.50 pg/g .
The creation of dioxins and furans during ignition and rates of their development have been appeared to rely on upon some variables including total destruction of dioxins and furans and their chemical “building pillars” in waste material amid burning. This is accomplished through the “3-T Rule” clarified as High burning Temperature to boost waste pulverization, adequate ignition Time (generally two seconds) to enhance waste annihilation; and High burning Turbulence to disperse warmth uniformly ensuring its complete annihilation. Secondly the noteworthy factor is the prevention of favorable conditions that support formation of dioxins and furans immediately following combustion (post-combustion). This is achieved by the specific design specifications like cooling post combustion gases quickly from higher temperatures through the temperature range of approximately 400 degree Celsius down to 250 degree Celsius, to avoid extended exposure in the temperature range that is known to favor dioxin and furan formation; and most importantly reduce the presence of certain metals, such as copper, on particulate matter, that are known to ease dioxin and furan formation .
Right now, the blazing of private junk or residential trash is thought to be among the biggest wellsprings of dioxins in the environment in the United States. There are numerous little things that we can all do to decrease dioxin levels in nature for instance we ought not to blaze household waste, particularly construction materials that may contain wood additives or plastics and we should try to diminish the utilization of dioxin-containing items, for example, PVC and other chlorinated chemicals .
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Citation: Lali Z (2018) Release of Dioxins from Solid Waste Burning and its Impacts on Urban Human Population- A Review. J Pollut Eff Cont 6: 215. DOI: 10.4172/2375-4397.1000215
Copyright: ©2018 Lali Z. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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